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We can get the display to stay in day mode (white) but as a result, you lose the auto toggle of the iDrive screen between day/night.

Is there a way to toggle the iDrive screen between night/day mode via button assigned to presets 1-8? (sorry, my car is still in the middle of the ocean so I can't test...)

The toggle does not change the iDrive from day to night mode, it just changes its brightness when the car is in night mode. You do loose that, but you can still adjust the brightness via the iDrive itself. As far as I am concerned, a minor inconvenience in exchange of getting rid of the ugly orange night mode in the cluster.

You Jeg23 (and possibly all f10s?) have the extended instrument cluster.
If you don't have that one, only the little bc part showing date/cons. etc will move from white to orange at night. The backlight of the gauges (ie tacho) will always be orange.

As for the 'iDrive nightmode' marsb007 probably means the navigation day/night switch.
As memory serves, I think you can assign a preset button to this. Alternatively, leave it in daymode it doesn't bother me that much personally.

I am sure this is not for everyone, but I personally like the bright daytime instrument display a lot better than the nighttime orange display. To me it is sharper looking and easier to read, with more contrast.

You can easily change a simple code so that it remains in daytime mode all the time:

KOMBI-->3007 KI_Dimmung, 24-->DIM_NACHT_EIN-->Werte=FF

The default value is Werte=0A. This hexadecimal value relates to the sensitivity of the sensor that determines the threshold at which the display changes into its nighttime mode. When set to “FF” it stays on the daytime mode constantly.

Your NV background pedestrian detection codes worked flawlessly btw. Excellent write-up. Will try to post a video of the results soon. People here need to know how good a job you and others have done for cars with NV, which until this point has remained turned off most of the time for my case.